16865989 has 8 divisors (see below), whose sum is σ = 20409408. Its totient is φ = 13606080.

The previous prime is 16865983. The next prime is 16866001. The reversal of 16865989 is 98956861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16865989 - 2¹¹ = 16863941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16865983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70747 + ... + 70984.

It is an arithmetic number, because the mean of its divisors is an integer number (2551176).

Almost surely, 2^16865989 is an apocalyptic number.

It is an amenable number.

16865989 is a deficient number, since it is larger than the sum of its proper divisors (3543419).

16865989 is a wasteful number, since it uses less digits than its factorization.

16865989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141755.

The product of its digits is 933120, while the sum is 52.

The square root of 16865989 is about 4106.8222508407. The cubic root of 16865989 is about 256.4507287816.

The spelling of 16865989 in words is "sixteen million, eight hundred sixty-five thousand, nine hundred eighty-nine".